SPL Horticulture Grow Light Digital Dimmable HPS MH System for Plants Horizontal Style Double Ended Reflector Reflector: 23 1/2" x 12"x 6 " Full Fixture for 1000W double ended lamps No acoustic resonance, more than 8% grow light compared to traditional lamps Light maintenance after 5000hrs &gt; 95% Output adjustable: 500/750/1000/1150Watt